Fsc part 2 online preparation for chemistry chapter 3 (group IIIA and Group IVA Elements)

Online Short Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

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Chemistry - 12th Class Chemistry Chapter 3 Short Questions Preparation

Question # 1

How does Aluminium react with a) NaOH b) H2SO4.

  • Ans 1: Alluminiumis dissolved in sodium hydroxide to give solube aluminate,with the evolution of hydrogen.
    Al + 2NaOH-----> + 6H2O----->NaAl(OH)4+ 3H2
  • Ans 2: Aluminium does not react with dilute sulphuric acid.However,it is oxidized by hot concentrated sulphuric acid to liberate sulphur dioxide gas.
    2Al + 6H2SO4-------->Al2(SO4)7+ 6H2O + 3SO2
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Prepare Complete Set Wise Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

12th Class Chemistry Chapter 3 Short Questions Preparation - Set 1

Question # 1

How does Aluminium react with a) NaOH b) H2SO4.

  • Ans 1: Alluminiumis dissolved in sodium hydroxide to give solube aluminate,with the evolution of hydrogen.
    Al + 2NaOH-----> + 6H2O----->NaAl(OH)4+ 3H2
  • Ans 2: Aluminium does not react with dilute sulphuric acid.However,it is oxidized by hot concentrated sulphuric acid to liberate sulphur dioxide gas.
    2Al + 6H2SO4-------->Al2(SO4)7+ 6H2O + 3SO2
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 2

Question # 1

What is asbestos?Give its two uses.

  • Ans 1: Asbestos is hydrated calcium magnesium silicate CaMg3(SiO3)4.It commonly used in making incombustible fabrics and hardboards,etc.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 3

Question # 1

Aqueous solution of borax is alkaline in nature.Justify the statement.

  • Ans 1: Aqueous solution is alkaline in nature due to hydrolysis.
    Na2B4O7+ 7H2O------->2NaOH +4H3BO3
    Borax Strong alkali Weak acid
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 4

Question # 1

Under what conditions aluminium corrode.

  • Ans 1: When aluminium sheet is exposed to moist air it acquires a thin,continuous coating of aluminium oxide,which is product of aluminium corrosion.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 5

Question # 1

Give two similarities between carbon and silicon.

  • Ans 1: Carbon and silicon both form acidic oxides where as other oxides areamphoteric in nature.
  • Ans 2: Both carbon and silicon form covalent bonds.Their oxides are acidic and both form hydrides and chlorides.
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12th Class Chemistry Chapter 3 Preparation

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